Problem with negative and postive boolean

[SjeloftheIrix]

When trying to make a lake for the water I set a terrain to negative and flip it upside down, put it in the plane which is set to positive and nothing happens, I put it level with the ground it doesn't even appear. For some reason it isn't cutting out, it just fills with dirt. When I try to put water in it nothing happens either. What am I doing wrong here?

 

[yandso]

In order to do that you need to group your neg and pos objects. Select both and then I believe you click the G or right click for the option menu.

Hope that helps
Roj